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The NHTSA is the US gov't agency tasked with vehicle safety. Complaints can be spread across multiple & redundant categories, & are not organized by problem. See the Back button — blue bar at the very top of the page — to explore more.

Get notified about new defects, investigations, recalls & lawsuits for the 2001 Audi S4:

S4

miles

Vehicle is experiencing radiator coolant leakage into engine oil. This is causing accelerated wear of components lubricated by the engine oil. Unless corrected, this contamination will lead to failure of the motor. The vehicle was inspected and tested by an Audi service center with no cause identified or solution proposed. Audi of America is not taking any action to address this problem.

S4 6-cyl

Manual transmission

46,000 miles

Coolant in oil. Can't trace it down, have had 5 rear main seals replaced, had the external oil filter parts replaced and still coolant is finding it's way into the motor, causing the motor to prematurely wear. Audi knows about the issue they have brought engines back to germany for review, but have yet come out with what is happening. What can we fix to stop this. I'm not looking for a recall, heck most people I know would just like to know what Audi messed up and how we can fix it. At this point the fix is unknown, stop leak in the coolant system but that's a bandaid and gunks up the motor. Audi and Audi of America need to step up and at least make the flaw known so that if there is a fix we can make it happen. If there is no fix, then I can understand Audi hiding the issue, since it would mean it's a machining defect, casting defect and it would be very costly to replace every 2.7T engine or head on the road (but they have been really bad about stepping up to other failures (turbos! ABS controllers, dash display pixels (gauge cluster, can bus), rocking front seats etc. Maybe it's time for some pressure to be applied to them. Just tell us!!

S4 6-cyl

Manual transmission

98,500 miles

I have a 2001 Audi S4. There is a vacuum line between the motor and firewall that has a check valve on it. The problem is that the check valve is prone to fail (talked to others on an Audi website that had this part fail also) and when it does, it fails w/O notice and causes the car to lose its power brakes. I think this is extremely dangerous, nothing happened to me, mine failed in a parking lot as I was parking, but what if I or someone had this part fail at say 50-60 mph and they had to stop the car? they wouldn't be able to. I fixed mine by by-passing this check valve. I think that you should look into this problem.

S4 6-cyl

Automatic transmission

44,150 miles

Please refer to ODI number 10159801 1. slow coolant leak and engine oil contamination 2. low oil light as well as low coolant indicator light, this causes wear and tear issue with engine to the extent that can damage major components within the engine. 3. Audi dealer has diagnose and run test to determine this problem but have not found fault. The symptoms still persists but are not acknowledge as a problem the Audi of America.

S4 6-cyl

Manual transmission

62,000 miles

Vehicle is experiencing radiator coolant leakage into engine oil. This is causing accelerated wear of components lubricated by the engine oil. Unless corrected, this contamination will lead to failure of the motor. The vehicle was inspected and tested by an Audi service center with no cause identified or solution proposed. Audi of America is not taking any action to address this problem.

S4 6-cyl

Automatic transmission

29,477 miles

There was a cam adjuster from where the oil leak was coming from. Noticed this on August 8, 2003. Then, on July 24, 2004 took the vehicle for an oil change a nd they confirmed there was another oil leak. The warranty expired in November 2005, and the consumer made arrangements for the gaskets to be replaced a month before the warranty ran out. In order to get to the gaskets the cam shafts had to be removed. The gaskets were replaced, , and cam shaft reinstalled, then gave it a tune up. Also, put in two different types of spark plugs; one set was platinum and conventional. A week later, it was ready for pick up. The exhaust sounded different when vehicle picked up. On January 31, 2005 took vehicle to another mechanic because the check engine was on. At that point mechanic determined O2 sensors caused the light to come on, and the exhaust sounded differently. Then, three months later, the exhaust cam shaft that broke it bent valves in cylinder head and caused it to crack.